That sounds flippant but imagine Denethor sending the right son to do the right job.
Faramir goes to the cool green glade of Elrond, where he speaks of dreams and waves, and the elves whisper that the blood of Numenor runs true in the House of Hurin; Boromir spends his time riding like hell between Ithilien and Osgiliath, speaking with men around smoky fires, embracing his captains and saying to them, take heart, gather your strength, these are the times which test a man’s soul and lift it to glory, but we will see dawn come, we will keep Gondor free.
Though they are cut from different cloth, this is something Boromir and Faramir have always shared–they are men deserving of leadership, they would be followed under the shadow of the East. Boromir aches for every one of his countrymen cut down, screams his defiance to the orc armies and rallies his arms; Faramir listens to the words of wisdom Aragorn offers, is gentle and kindly with the hobbits, greets Legolas in his mother tongue, offers Master Gimli praise.
Wandering with the Fellowship below the empty sky, Faramir looks up at Maethor, the Warrior constellation, and thinks of his brother, prays that he is well, that he is safe, that he is still a little pompous, stilted, honest.
Boromir spends another sleepless night playing with the chain at his neck, the small portraits of his mother and brother. (I cannot lose you too, I cannot–come back hale and whole, come back angry and proud and cunning and defiant of our father–)
Faramir has never known the weight of all Gondor on his shoulders, and so is not tempted by the power the Ring offers.
Boromir has always known the love of his father, and so never bears the scorn of Denethor when Osgiliath must be abandoned as too tenuous a position to hold.
The day that Faramir comes striding into the Citadel, a child and wizard at his heels, Boromir cries out with joy as he has not for more years than counting, and they nearly bruise one another with their embrace.
“You are almost skeletal, little brother,” Boromir laughs, though it is not true–Faramir looks touched with strangeness and greatness, as one whom the Witch-Queen of Lorien found favor in, whose nobility of form and face had ensnared the heart of the White Princess of Rohan.
“And you look at least two-stone heavier, elder brother,” Faramir says, though it is false, Boromir is hollowed out and worn thin, deep shadows beneath his eyes and hunger-starved cheeks; in a glance, Faramir knows he neither eats nor sleeps nor laughs, nor feels–and Faramir, wiser and older than when he left, can see the weight his brother has always carried, and how lightly–all the stone of Minas Tirith on his shoulders, and still–
contexts in which jkr introduces her readers to remus:
book 3: in his first scene he conjures a patronus and passes around chocolate
book 3: in his second scene he teaches them all a spell focused in overcoming fears with laughter
book 5: in his first scene he rescues harry from an abusive household, and smiles widely at harry while he does it
book 6: in his first scene he is handed a large slice of cake
book 6: in his second scene everyone is sitting around a fire at christmas drinking eggnog
book 7: when he rolls up to The Squad in grimmauld place he passes around butterbeers and hermione lights a fire in the fireplace
rowling does this thing where even if remus is having The Literal Worst Time he is almost always introduced in the context of warmth and light and comfort, which he more often than not is directly providing to others